SimpleModal maxHeight does not seem to work in IE

SimpleModal maxHeight does not seem to work in IE

The below modal call works just fine in FF or any other good browser but when it comes to IE it completely ignores the maxHeight constraint.  Any insight is much appreciated. 

  1.              $("#xxx").modal(
                {
                    autoResize:false,
                    maxHeight:500,
                    minWidth:625,
                    escClose: false,
                    overlayClose: false,
                    dataId: "xxxx",
                    onOpen: function (dialog) {
                        dialog.overlay.fadeIn('slow', function () {
                            dialog.container.slideDown('slow', function () {
                                dialog.data.fadeIn('slow');
                            });
                        });
                    },
                    onClose: function (dialog) {
                        dialog.data.fadeOut('slow', function () {
                            dialog.container.slideUp('slow', function () {
                                dialog.overlay.fadeOut('slow', function () {
                                    $.modal.close();
                                });
                            });
                        });
                    }               
                });